Nuclear and Radiation Accidents - Nuclear Power Plant Accidents

Nuclear Power Plant Accidents

One of the worst nuclear accidents to date was the Chernobyl disaster which occurred in 1986 in Ukraine. That accident killed 30 people directly, as well as damaging approximately $7 billion of property. A study published in 2005 estimates that there will eventually be up to 4,000 additional cancer deaths related to the accident among those exposed to significant radiation levels. Radioactive fallout from the accident was concentrated in areas of Belarus, Ukraine and Russia. Approximately 350,000 people were forcibly resettled away from these areas soon after the accident.

Benjamin K. Sovacool has reported that worldwide there have been 99 accidents at nuclear power plants from 1952 to 2009 (defined as incidents that either resulted in the loss of human life or more than US$50,000 of property damage, the amount the US federal government uses to define major energy accidents that must be reported), totaling US$20.5 billion in property damages. Fifty-seven accidents have occurred since the Chernobyl disaster, and almost two-thirds (56 out of 99) of all nuclear-related accidents have occurred in the USA. There have been comparatively few fatalities associated with nuclear power plant accidents.

Nuclear power plant accidents and incidents
with multiple fatalities and/or more than US$100 million in property damage, 1952-2011
Date Location Description Deaths Cost
(in millions
2006 $US)
INES
level
01957-10-10October 10, 1957 Sellafield, Cumberland, United Kingdom A fire at the British atomic bomb project destroyed the core and released an estimated 750 terabecquerels (20,000 curies) of radioactive material into the environment. 0 5
01961-01-03January 3, 1961 Idaho Falls, Idaho, United States Explosion at SL-1 prototype at the National Reactor Testing Station. All 3 operators were killed when a control rod was removed too far. 3 22 4
01966-10-05October 5, 1966 Frenchtown Charter Township, Michigan, United States Partial core meltdown of the Fermi 1 Reactor at the Enrico Fermi Nuclear Generating Station. No radiation leakage into the environment. 0
01969-01-21January 21, 1969 Lucens reactor, Vaud, Switzerland On January 21, 1969, it suffered a loss-of-coolant accident, leading to a partial core meltdown and massive radioactive contamination of the cavern, which was then sealed. 0 4
01975-01-011975 Sosnovyi Bor, Leningrad Oblast, Russia There was reportedly a partial nuclear meltdown in Leningrad nuclear power plant reactor unit 1.
01975-12-07December 7, 1975 Greifswald, East Germany Electrical error causes fire in the main trough that destroys control lines and five main coolant pumps 0 443 3
01976-01-05January 5, 1976 Jaslovské Bohunice, Czechoslovakia Malfunction during fuel replacement. Fuel rod ejected from reactor into the reactor hall by coolant (CO2). 2 4
01977-02-22February 22, 1977 Jaslovské Bohunice, Czechoslovakia Severe corrosion of reactor and release of radioactivity into the plant area, necessitating total decommission 0 1,700 4
01979-03-28March 28, 1979 Three Mile Island, Pennsylvania, United States Loss of coolant and partial core meltdown due to operator errors. There is a small release of radioactive gases. See also Three Mile Island accident health effects. 0 2,400 5
01984-09-15September 15, 1984 Athens, Alabama, United States Safety violations, operator error, and design problems force a six year outage at Browns Ferry Unit 2. 0 110
01985-03-09March 9, 1985 Athens, Alabama, United States Instrumentation systems malfunction during startup, which led to suspension of operations at all three Browns Ferry Units 0 1,830
01986-04-11April 11, 1986 Plymouth, Massachusetts, United States Recurring equipment problems force emergency shutdown of Boston Edison’s Pilgrim Nuclear Power Plant 0 1,001
01986-04-26April 26, 1986 Chernobyl, Ukrainian SSR Overheating, steam explosion, fire, and meltdown, necessitating the evacuation of 300,000 people from Chernobyl and dispersing radioactive material across Europe (see Chernobyl disaster effects) 56 direct; 4,000 cancer 6,700 7
01986-05-04May 4, 1986 Hamm-Uentrop, Germany Experimental THTR-300 reactor releases small amounts of fission products (0.1 GBq Co-60, Cs-137, Pa-233) to surrounding area 0 267
01987-03-31March 31, 1987 Delta, Pennsylvania, United States Peach Bottom units 2 and 3 shutdown due to cooling malfunctions and unexplained equipment problems 0 400
01987-12-19December 19, 1987 Lycoming, New York, United States Malfunctions force Niagara Mohawk Power Corporation to shut down Nine Mile Point Unit 1 0 150
01989-03-17March 17, 1989 Lusby, Maryland, United States Inspections at Calvert Cliff Units 1 and 2 reveal cracks at pressurized heater sleeves, forcing extended shutdowns 0 120
01992-03-01March 1992 Sosnovyi Bor, Leningrad Oblast, Russia An accident at the Sosnovy Bor nuclear plant leaked radioactive gases and iodine into the air through a ruptured fuel channel.
01996-02-20February 20, 1996 Waterford, Connecticut, United States Leaking valve forces shutdown Millstone Nuclear Power Plant Units 1 and 2, multiple equipment failures found 0 254
01996-09-02September 2, 1996 Crystal River, Florida, United States Balance-of-plant equipment malfunction forces shutdown and extensive repairs at Crystal River Unit 3 0 384
01999-09-30September 30, 1999 Ibaraki Prefecture, Japan Tokaimura nuclear accident killed two workers, and exposed one more to radiation levels above permissible limits. 2 54 4
02002-02-16February 16, 2002 Oak Harbor, Ohio, United States Severe corrosion of control rod forces 24-month outage of Davis-Besse reactor 0 143 3
02004-08-09August 9, 2004 Fukui Prefecture, Japan Steam explosion at Mihama Nuclear Power Plant kills 5 workers and injures 6 more 5 9 1
02006-07-25July 25, 2006 Forsmark, Sweden An electrical fault at Forsmark Nuclear Power Plant caused one reactor to be shut down 0 100 2
02011-03-11March 11, 2011 Fukushima, Japan A tsunami flooded and damaged the 5 active reactor plants drowning two workers. Loss of backup electrical power led to overheating, meltdowns, and evacuations. One man died suddenly while carrying equipment during the clean-up. 1 non nuclear accident caused. 7

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